Angled Main Screed End Faces for Paving Material Flow

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Solution Overview

Problem

Rear mount screed assemblies experience material segregation and flow issues due to sharp corners on the main screed, leading to increased wear and potential binding of screed extensions during retraction, which affects the quality of the roadway mat.

Innovation Solution

The main screed in the rear mount screed assembly features angled end faces, with an angle less than 90 degrees, to improve material flow and reduce pinching between the end face and endgate, allowing for smoother operation and reduced wear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the main screed has sharp corners (90 degree end faces), then the structure is simple and easy to manufacture, but material segregation and flow issues occur leading to increased wear and potential binding of screed extensions

Engineering Contradiction:

Improveease of manufactureVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies curvature by changing the sharp 90-degree corner of the main screed to a rounded corner with a specified radius (e.g., 0.5 to 2 inches). This curvature modification eliminates material pinching and segregation at the corner region, improving material flow and reducing wear on the screed and endgates while maintaining structural simplicity

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent changes the geometric parameter of the end face angle from 90 degrees to an obtuse angle (greater than 90 degrees). This parameter change modifies the material flow characteristics, preventing material from being pinched between the end gate and screed corner, thereby reducing wear and improving reliability

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the main screed has sharp corners, then the manufacturing is simpler, but material flow is impaired causing pinching between end face and endgate

Engineering Contradiction:

Improveease of manufactureVSAvoidproductivity

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The rounded corner design with specified radius creates a smoother material flow path, eliminating pinching points where material would otherwise be trapped between the sharp corner and end gate. This improves productivity by preventing material flow interruptions while the curvature radius is kept within practical manufacturing limits

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Device complexity

If the main screed has sharp corners, then the structure is simpler, but component wear increases due to material pinching

Engineering Contradiction:

Improvedevice complexityVSAvoidcomponent wear

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The rounded corner eliminates the pinching effect that causes material to accumulate and increase wear on the end gate and screed components. The curvature distributes material flow more evenly, reducing concentrated stress and wear at the corner region while adding minimal complexity to the overall device structure

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

Changing the end face angle from 90 degrees to an obtuse angle modifies the contact geometry between material, end gate, and screed. This parameter change reduces the pinching force and material accumulation, thereby reducing wear on components while maintaining relatively simple device structure

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If the main screed has sharp corners, then the design is simpler, but screed extensions may bind during retraction due to material compression

Engineering Contradiction:

Improvedevice complexityVSAvoidease of operation

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The rounded corner creates a smoother transition zone that prevents material from being compressed and trapped during screed extension retraction. This eliminates binding issues and ensures smooth operation during width adjustments while keeping the overall device design simple

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The obtuse angle configuration of the end face prevents material from being pinched during retraction operations. This geometric parameter change ensures that material flows smoothly past the end gate without compression, allowing easy retraction of screed extensions while maintaining simple device structure

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10323363B1Angled main screed for improved material flow

Publication Date: 2019.06.18 CATERPILLAR PAVING PROD INC

AI summary

A rear mount screed assembly may include a main screed comprising a front face and an angled end face. An angle between a plane of the front face of the main screed and a plane of the angled end face of the main screed may be less than 90 degrees. The rear mount screed assembly may include a screed extension arranged behind the main screed relative to a direction in which the rear mount screed assembly is to be moved during operation.